Polyphase distant-control system for differential transmission



1,61 ,195 Feb.. 8,1927. E GRANAT 6 POLYPHASE DIS-TANT CONTROL SYSTEM FOR DIFFERENTIAL TRANSMISSION Filed sept. 14. 1925 s sheets-sheet 2 Feb. 8 1927. E. GRANAT POLYPHASE DISTANT CONTROL SYSTEM FOR DIFFERENTIAL TRANSMISSION Filed Sept. 14. 1925 5 Sheets-Sheet 3 1,616,795 Feb 3 1927' E. GRANAT -POLIYPHASE DISTANT CONTROL SYSTEM FOR DIFFERENTIAL TRANSMISSION Filed Sept. 14. 1925 5 Sheets-Sheet 4 feb, 8, 1927. E GRANAT POLYPHASE DISTANT COTROL SYSTEM FOR DIFFERENTIAL TRANSMISSION Filed Sepia. 14. 1925 5 Sheets-Sheet 5 Patented Feb. s, i927.

PATENT OFFICE..

Enna omar, or rams, FRANCE.

POLYPHASE DISTANTeCONTBOL SYSTEM FOR DIFFERENTI. TRANSMISSION.

Application illed September 14, 1925, Serial No. 56,380, and in France September-20, 1924.

The present invention relates to a distant control system utilizing polyphase current. -Arrangements of this class must comply with the following conditions: l 5 1.-'Therotation of the receiver, relative to the rotation o the transmitter, should have Va `constant ratio, in such manner that when the transmitter is rotated through acertain angle, the receiver will rotate in a l reliable manner through an angle which corresponds thereto according to predetermined conditions'.

2.-The rate of rotation of the receiver should vary within wide limits from zero to l the maximum allotted t0 the controlled apparatus. .1

Sincer the system must operate 'according to this latter condition at rates which are necessarily variable, the electric distant control device is obliged to operate under very diicult circumstances, since in fact the load couple of the actuated apparatus is substantially constant at all speeds, whilst the power Y y couple ofthe receiver varies with the speed, and will as a rule diminish when the speed increases;. so' that at a certain speed the power couple will be lower than the load` fcouple, and the control-system will fail to operate. I My said apparatus.4 serves chiefly to obviate this drawback by providing a distant control arrangement which will v'operate under wide variations of load with small variations in the power couple. The differential transmissionv is also assured by the adequate dispositions which are s`et forth hereunder.

The general arrangement essentiallycomprisesa transmitter and a receiver connected 4 together by a line and supplied by polyphase current.

The/transmitter is an electric device comprising a stator with polyphase winding which is supplied at N equidistant stationary contact points by the said polyphase line. The rotor, which is of the wire-wound type andis provided with a commutatonis supplied with polyphase current by N equidistant stationary brushes which are connested with the line L, in shunt upon the p stator. The said commutator is provided wir? f.; rotatable brush holder comprising N- brushes which are connected with the line L leading to the receiver. Y

The receiver comprises a stator with polyphase winding which is supplied at N'equidistant contact points which Yare connected with the line wires L; the polyphase rotor is supplied by the rotatable brushes of the transmitter through the medium of N slip rings and N stationary brushes. Inversely, the stator may be connected with the transmitter,and the rotor with the line. I may further construct a device in which the armaturey Vof the transmitter is rotated by means of an auxiliary motor, and herein the transmitter will operate as a generator.

Byway of example, which is not of a limitative nature, "I have'described' hereunder and represented in the appended drawings a form of construction of the said electric distant control devicewhich is supplied with alternating current, as well as various modifications. a

Fig. l is a detail view of a distant control device in which. the transmitter is operated by a handle, and Fig. 2 is a diagrammatic view of the same device in which the transmitter is actuated .by a mechanical element which is itself driven through suitable transmission means. Fig. 3 is a diagrammatic view of a differential transmission arrangement with multiple controlling station and a polyphase receiver with double supply. Fig. 4 is a diagrammatic view showing another differential transmission arrangement comprising a single controlling station and a receiver with single supply. Fig. 5 is a diagrammatic view of another differential transmission arrangement wherein the transmitter of Fig. 4 is combined with the receiver of Fig. 3. Fig. 6 is a diagrammatic view of another diierential transmission 'device wherein suitable transmitters of the type shown inFig. 4, which are connected in series, serve at the same time as transmitters and receivers. The arrangement shown in Fig. 1 comprises asftator 1 which is provided with a uniformfyA distributed three-phase winding to whicli'the current is supplied at the three equidistnt vContact points 4, 5, 6. Thev suitably woind rotor 2 is provided with a com'- mutator 3 and is supplied with currentby the three stationary'brushes 7 9 which are connected with the line wires said device comprising three brushes 10, 11,

`12 Set at 120 degrees apart, the same being controlled by the hand wheel 31 through the medium of the bevel gearing 32 and 33. The

said Vbrushes are connected to the three ref speed. rl`he E. at the rotatable brushes 10, 11, 12 is displaced in phase relatively' spective wires'16, 17, 18 which connect the transmitter A with the receiver B.

The receiver B comprises a stator provided withl a uniformly distributed threephase winding 19. The said stator is sup-- -plied by the three equidistant contacts 21,

22, 23 which are connected'with the respective wires 13, 14, 15 of the three-phase line. The three-phase rotor comprises the three Aslip rings 27, 28, 29 co-operating with the Vline L, whose v frequency is F, will each set Vup a revolving field.I The vphase displacement of these two fields is constant, andf depends upon the position of the stationary brushes 7, 8, 9, so that Ithe rotor of the transmitter will be actuated at a determined to the E. M. F. of the main line, and this 'displacement will depend upon the position of the rotatable brushes 10, 11, 12 relatively to the position of the stationary brushes.l 7,

During the .time in which the set of brushes'lO, 11, 12 remains stationary, the frequency of the current in the line C will have the same value as the frequency F of the current supplying the line L. The rotor of the receiver which is connected with the brushes 10, 11, 12 by the Wires 16, 17. 18 is supplied withthree-phase current of the same frequency F. The stator and the rotor of the receiver;which are both supplied by an alternating lcurrent whose frequency is F, will each set up a revolving'ield havingV v:as

the same speed, so thatthe said supply will Aoccasion no relative speed between the revolving field. of the stator and of the rotor.

ANo mechanical couple will be produced, and

the rotor will-hence remain. stationary.

lBut if the set of the three rotatable brushesl 10. 11, 12 is displaced by means of the h and wheel 31, for instance through the medium o'f the bevel gearing 32 and 33, this will varv the phase displacement between the E.

M. IF. of the line (brushes 7. 8. 9) and the E. M. F.' at the brushes 10, 11, 12,-and hence the frequency of the current inthe line C will vary during the period of movement according to the displacement of lthe brushes 19, 11, 12. f- Y j s ,L The device 30 1s movable about the said commutator,

-rotating brushes of the transmitter. receiver acts as a three-phase auto-synchro- This Icurrent of variable 'frequency FlzF-f-f which supplies the three-phase winding 20 ofthe rotor `of the receiver B by means of the wires 16, 17 18 and of the brushes 24, 25, 26 a'nd the slip rings 27, 28, 29 respectively connected with three equidistant contact points on the rotor 10,-will set up a revolving tield which rotates at a variable-Speed, said speed being diiferent from that of the revolving field of the stator.

The revolving field of the rotor will thus be displaced relatively to the stator field, thus producing a certain couple, so that the rotor-of the receiver will rotate in the proper `direction through an angle which correspondsexactly to the displacement ofTte nous motoroperating at a Speed which is variable Within very large limits, with small variations of torque. v

Fig. 2 represents an electrictransmittin'g device of the aforesaid type in which the set of mov le brushes of the transmitter is controlled irectly by the rotation of a suitable receiving element Z. The said transmitter will exactly reproduce the movement of the said receiver.

The aforesaid distant control device serves chiefly `for differential control with polyphase current, and will reproduce upon thev receiving -shaft the algebraic sum of the movements of a certain number of trans-` mitters.

An analogous distant control device, op# erated by continuous current. has been set forth in the U. S. patent application 21,175 filed on the' 6th of April, 1925.

Fig. 3 shows a diierential electric transmitting system operating upon alternating current, which affords the algebraic sum of any number of corrections upon the shaft of a receiver by the utilization of a doublefeed type of polyphase receiver as set forth in the said patent application.

1 The saiddevice comprises two transmitters of the aforesaid type. Firstly. the

transmitter D supplies' the rotor of the l'eceiver F. Secondly` the transmitter E Supl plies the stator of the receiver F, so that the rotor of the receiver VF-will rotate through an angle represented by the algebraic sum of the displacements of the brush.sets of each transmitter'. I may urther use mechanical control for the rotation of the brush set of a transmitter G, by means of the shaft of the receiver F; said brushes will supply the rotor of an additional receiver I with alternating current at variable frequency, the stator being supplied by the transmitter lil."

`I thus collect upon the shaft of the receiver I the algebraic sum of the movements of the three transmitters. -By the aforesaid series'mounting of the transmitters Aand receivers, I can obtain the sum of an unlimited number 4of corrections.

l The aforesaid transmitter A may be modified in the following manner in order to constitute a differential' transmission arrangement of a different type wherein a single control station (Fig. 4) is employed. The stator is supplied with three-phase current from the line L by three equidistant contacts 3, 4, 5. The rotor E comprises two i commutators 1 and 2. Around the comter set may be displaced by`means of thehand wheel l14, through the medium of the two bevel gars 12 and 13. The brushes 9, 10, 11' are connected with the line L by the three slip rings 44, 45, 46 and the three stationary brushes 38, 39, 40. The commutator 2 is provided with a set of three ,rotatablev brushes 15, 16, 17 mounted upon a toothed ring 18. The Said set is controlled by the 'hand wheel 20 through the medium of the two bevel gears 18and 19. The brushes 15, 16, 17 are connected with the respective wires 21, 22, 23 of the line C through the I medium of the slip rings 47, 48, 49 and the stationary brushes 41, 42, 43. The rotor is of the same type as above set forth.

The operation is asv follows:

vIf the movable set of the commutator I is displaced through a certain angle a, the phase of the EIM. F. supplying the rotor at the brushes 9, 10,11 will vary, and hence the E. M. F. supplying the rotatable brushes of the commutator 2 will be changed in phase bya like angle. Duefto thelixed position of the three brushes 6, 7, 8 connect-ed with the stator, the speed of rot-ation of the transmitter is independent of the position of the three movable brushes 9, 10, 11.

This displacementY of the brushes 9, 10, 11 will produce in the connecting line C a varit ationv in frequency relatively to the` frequency of the main line. The revolving field of the receiver will thus be-displaced with reference to the eld of the stator. This will produce a 'certain torque, and the rotor of the receiver willrotate in -the proper direction through an angle a corresponding ex'- actly to the displacement of the set of rotatable brushes 9, 10,11 of the transmitter. If the movable set of the commutator 2 is now displaced through anangle b this will proof the main line, and the rotor of t e` re ceiver will turn through the angle b, as above set forth. l

The said arrangement thus provides an electric distant control system of the differential type, enabling a given transmitting station to transmit the algebraic sum of two movements. I may further dispose around a given commutator a plurality of sets of movable brushes in order to increase the number of unit movements which are transmitted.

'By the combination of the transmitter shown in Fig. 4 with the receiver shown in Fig. 3, I am enabled to obtain the sum of a certain number of movements in a distant receiver, by the use of several transmitters, In this manner, the device described hereunder and shown in Fig. 5 will afford the sum of four movements in a single receiver. and consists of the following elements. I employ two transmitters A- B of the same type as the transmitter A of Fig. 4 and a receiver C which is the same as the receiver -B of Figs. 1 to 4. The rotor of the receiver C is connected with the three wires of the line F leading from the transmitter B through the medium of 3 brushes co-operating with 3 respective slip rings. The stator of the receiver C is connected with the three wires of the line E leading from the transmitter A. In this manner, any rotation of the controlling wheels V1 V2 of the trans-` mitter A will cause the corresponding displacement of the rotor field of the receiver, and any rotation of the wheels Vs V4 of the transmitter B will cause the corresponding displacement of the rotor field of the receiver. In consequence, the rotation of the rotor D relatively to the lstator will correspond to the algebraic sum of the movements of the four wheels/Vf V2 V3 V4. .I may control the wheels V V2 of another transmitter A by the receivers of two systems of transmission or by a receiver and a hand control device, and may thus obtain a great Inumber of combinations for differential transmission, adding together as many unit elements as may be desired.

The transmission arrangement shown in Fig. 6 comprises a series oftransmitters of the type shown in Fig. 4. Herein all the stators of the said transmitters are supplied, from a commony three-phase line L. The rotatable brushes of the commutator 2 of each transmitter vare electrically connected with therotatable brushes of the commutator 1 of the succeeding transmitter.

The rotatable brushes of the commutator 2 ot'- the last transmitter D are connected through the three brushes and the three corresponding slip rings with the rotor of a receiver E of the type described in Fig. 1 wherein the stator is supplied by the main line L.

It -will be noted that the resulting dis- 'piacementof the rotor of the receiver corresponds to the algebraicY sum of the unit "movements of the wheels V,l V2 V,I V,L Vls VQ unit movements of the set of transmitters, its

stator can be supplied by the line L and its rotor by the rotatable brushes controlled by the hand wheel V4, thus affording in a receiver .the Sum: V1'}V2|V3l-V,. Y

What I claim is: A u u 1. In an electric distant control transmission arrangement: a polyphase main line, a transmitting station comprising a stator provided with a 'polyphase winding which f' is supplied at' N equidistant contact points by said main line, a wire wound rotor, a commutator Afor said rotor, brushes connects ed to said main line and supplying the said rotor with polyphase current, a movable brush holder, and .brushes carried by said brush holder and rotatable about the commutator, a receiving station comprising a stator supplied by the polyphase main line, and a rotor; and wires connecting the rotatable brushes of the transmitter to the rotor of the receiving station.

2. In an electric distant control transmission arrangement; a polyphase main line, a transmitting station comprising a stator provided with a poly hase winding which is supplied at N equi istant contact points by said main line, a wire'wound rotor, an

auxiliary motor controlling said rotor, a commutator for sa1d rotor, brushes connected toI said main line and supplying the said,

rotor with polyphase current, a movable brush holder, and brushes carried by said brush holder and rotatable about the commutator, a receiving station comprising a' stator supplied by the polyphase main line, and a rotor; and wires connecting the rotatable brushes of the transmitter to the rotor of the receiving station.

3. In an electric distant control transmission arrangement: a polyphase main line` a transmitting station comprising a stator provided with a polyphase Winding-which 1s supplied atA N equidistant contact points by said main line, a wire wound rotor, a commutator for said rotor, brushes connected to said main line and supplying the said rotor with polyphase current, amovable -brush holder, and brushesy carried by said brush holder and rotatable about the commutator, a receiving element whose shaft controls said brush holder a receiving station comprising a stator supplied by the polyphasemain line, and a rotor; and wires connecting the rotatable brushes of the transmitter to the rotor of the receiving sta.-

..tion.

. 4. A distant control transmission arrangement of the differential type comprising a type of receiver as set forth in claim 1 which receives, due to the supply of its stator and rotor by two polyphase distant control lines, movements which are independent of one another, and which by rea-` son of the series mounting of the transmitters and the receivers of this type, will afford the algebraic sum of any suitable number of movements.

5. In an electric distant control transmis- 'rotor of the receiving station.

6. VIn an electric distant control transmission arrangement: a polyphase main line, a transmitting station comprising a stator provided with a polyphase winding which isf supplied at N equi istant Contact points by said main line, a wire wound rotor, a commutator for said rotor, brushes connected to said main line and supplying the said rotor with polyphase current, a lurality of movable brush holders with independent 'oon-- trol, and brushes carried by saidl brush holders androtatable about the commutator, a receiving station comprising a stator supplied by thepolyphase main line, and a rotor; and wires connecting the rotatable brushes of the..l transmitter to the rotor of the-receiving station.

7. The combination of two transmitters as referred to inclaim 5 whereof eachcomprises two v'sets of movable brushes, and a double supply receiver, together with the disposition of a plurality of transmitters and receivers of this type in series in order to afford the sum of a plurality of movements.

8. The combination assuring the sum of a plurality of movements by means of a series of transmitters as set forth in claim-5 whereof each comprises two sets of brushes connected in lseries and wherein the second movable brush set. of the last transmitter supplies the rotor of a receiver,

9. The combination giving the sum of a receiver having its rotor connected with the plurality o'f movements by means of a series rotatable brushes of one of the transmitters of transmitters as set-forth in claim 5 wherein order to' obtain the sum of part of the 10 -of each comprises two Sets of brushes conabove-mentioed movements. 5 nected in 'series' and wherein the second In testimony whereofl aHX my signature.

movable brush set of the last. transmitter supplies the rotor of a receiver, an auxiliary y ELIE GRANAT. 

